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X-Ray Powder Diffraction Study of the Tungsten Bronze Type Barium Sodium Niobates

Published online by Cambridge University Press:  10 January 2013

M. Shimazu ,
Y. Kubota ,
T. Wada  and
S. Tsutsumi
M. Shimazu
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba-Shi, Ibaraki 305, Japan
Y. Kubota
Affiliation:
Institute of Earth Science, School of Education, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-Ku, Tokyo 160, Japan
T. Wada
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba-Shi, Ibaraki 305, Japan
S. Tsutsumi
Affiliation:
Institute of Earth Science, School of Education, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-Ku, Tokyo 160, Japan
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Abstract

Ba2NaNb5,O15 and eighteen additional compositions in the NaNbO3-BaNb2O6 system from 60 to 85 mole % BaNb2O6 have been prepared and studied by X-ray powder diffraction. A calculated pattern has been used to aid in indexing the powder pattern of stoichiometric Ba2NaNb5O15(BNN-S). The lattice parameters of BNN-S have been determined from repeated measurements of 2 higher order reflections and are a=b=17.5994(8)Å and c=7.9771(9)Å. A comparison with the Powder Diffraction File (PDF) 34-210 indicates that the present data provide a more precise match to the unit cell, include additional weak reflections and cover a greater 2θ range. There is a tungsten bronzetype solid solution range from 60 to 75 mole % BaNb2O6.

Type
Research Article
Information
Powder Diffraction , Volume 5 , Issue 3 , September 1990 , pp. 125 - 130
Copyright
Copyright © Cambridge University Press 1990

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